Meaning

adjective without logical or meaningful connection

adjective (physics) of waves having no stable definite or stable phase relation

adjective unable to express yourself clearly or fluently

originEtymology tree Proto-Indo-European *né Proto-Indo-European *n̥- Proto-Italic *n̥- Latin in-bor. Middle English in- English in- Proto-Indo-European *ḱe? Proto-Indo-European *ḱóm Proto-Italic *kom Proto-Italic *kom- Latin con- Latin haereō Latin cohaereō Latin cohaerēnsder. Middle French coherentder. English coherent English incoherent From in- + coherent.

Etymology from Wiktionary, CC BY-SA 3.0